1. A group of Spirogyra
filaments in confocal stereo view. The upper three have just one helical chloroplast
per cell, while the lowermost has three. Gaps at the ends of the helices are
where the cross walls of the cells lie - they are not visible. The long cell
in the lowermost filament has recently divided, as shown by the severed ends
of the chloroplasts just right of centre.
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